Boomilever B/C

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Re: Boomilever B/C

Post by OpticsNerd » February 1st, 2019, 10:27 am

BilalHayat19 wrote:Does anybody know boomilever designs people create at regionals, states, and nationals?
I wouldn't look at regionals resigns. Most either get sub-500 scores or get tiered.

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Re: Boomilever B/C

Post by sciencecat42 » February 2nd, 2019, 9:47 pm

idislikeboomi wrote:
jinhusong wrote:With Gorilla Glue, groove base for the tension stick and laminate.
Is there a good guide for how to laminate for boomilevers? I'm new to the event and am not familiar with the process of lamination in this context.
Lamination is when you layer pieces of wood on top of each other (often in opposing directions) to add extra strength (usually to a joint). For the distal end, I've found that actually laminating it is unnecessary. I usually just attach the tension to compression, then add a balsa piece on top and bottom of the connection point, but I don't add an extra layer on top.

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Re: Boomilever B/C

Post by embokim » February 3rd, 2019, 11:02 am

Hello,

I am doing Boomilever this year and I keep on seeing this wood used for the tension members. The wood looks almost like it is flimsy. Can anyone point me in the direction towards how to get my hands on this mysterious wood?
Thanks in advance.
Happy to be here

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Re: Boomilever B/C

Post by TheSquaad » February 3rd, 2019, 11:24 am

embokim wrote:Hello,

I am doing Boomilever this year and I keep on seeing this wood used for the tension members. The wood looks almost like it is flimsy. Can anyone point me in the direction towards how to get my hands on this mysterious wood?
Thanks in advance.
What wood are you referring to?

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Re: Boomilever B/C

Post by embokim » February 3rd, 2019, 12:12 pm

Nevermind, I realized I was just looking at the laminated portion of the distal end.

I was thinking...What would happen if you made the boomilever more narrow and just connect the tension members 5cm before the loading block area? Would it increase the twisting forces on the compression members too much to cancel out any mass benefits from the wood saved?
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Re: Boomilever B/C

Post by embokim » February 3rd, 2019, 12:28 pm

Nevermind, I realized I was just looking at the laminated portion of the distal end.

I was thinking...What would happen if you made the boomilever more narrow and just connect the tension members 5cm before the loading block area? Would it increase the twisting forces on the compression members too much to cancel out any mass benefits from the wood saved?
Happy to be here

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Re: Boomilever B/C

Post by Unome » February 3rd, 2019, 5:18 pm

embokim wrote:Hello,

I am doing Boomilever this year and I keep on seeing this wood used for the tension members. The wood looks almost like it is flimsy. Can anyone point me in the direction towards how to get my hands on this mysterious wood?
Thanks in advance.
Bass wood?
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Re: Boomilever B/C

Post by MadCow2357 » February 3rd, 2019, 8:02 pm

Unome wrote:
embokim wrote:Hello,

I am doing Boomilever this year and I keep on seeing this wood used for the tension members. The wood looks almost like it is flimsy. Can anyone point me in the direction towards how to get my hands on this mysterious wood?
Thanks in advance.
Bass wood?
Bass wood being flimsy doesn't sound right... I'm confused at what you're asking embokim...
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Re: Boomilever B/C

Post by sciencecat42 » February 3rd, 2019, 10:06 pm

MadCow2357 wrote:
Unome wrote:
embokim wrote:Hello,

I am doing Boomilever this year and I keep on seeing this wood used for the tension members. The wood looks almost like it is flimsy. Can anyone point me in the direction towards how to get my hands on this mysterious wood?
Thanks in advance.
Bass wood?
Bass wood being flimsy doesn't sound right... I'm confused at what you're asking embokim...
Pretty sure he meant a balsa sheet being used for lamination.
embokim wrote:Nevermind, I realized I was just looking at the laminated portion of the distal end.

I was thinking...What would happen if you made the boomilever more narrow and just connect the tension members 5cm before the loading block area? Would it increase the twisting forces on the compression members too much to cancel out any mass benefits from the wood saved?
If you're just shortening the tension pieces, you'll save negligible mass. Much better to have them attached at the end so the end of your compression chords don't snap off.

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Re: Boomilever B/C

Post by jinhusong » February 4th, 2019, 7:35 am

sciencecat42 wrote:
MadCow2357 wrote:
Unome wrote: Bass wood?
Bass wood being flimsy doesn't sound right... I'm confused at what you're asking embokim...
Pretty sure he meant a balsa sheet being used for lamination.
embokim wrote:Nevermind, I realized I was just looking at the laminated portion of the distal end.

I was thinking...What would happen if you made the boomilever more narrow and just connect the tension members 5cm before the loading block area? Would it increase the twisting forces on the compression members too much to cancel out any mass benefits from the wood saved?
If you're just shortening the tension pieces, you'll save negligible mass. Much better to have them attached at the end so the end of your compression chords don't snap off.
Making the distance between compression members short can save some weight. I saw some school still attach the tension members at the end but they raise a small platform for the loading block above the tension sticks from compression members.

Another example is the chimney compression style. Just connect as normal, the space is already over or close to 5 cm for the loading block.

Jinhu

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